make it easyer to config mail for nextcloud and also be able to inject the secret as passFile:

from

settings = {
  # ...
  mail_smtpmode = "smtp";
  mail_smtpsecure = "ssl";
  mail_sendmailmode = "smtp";
  mail_from_address = "cloud";
  mail_domain = "example.com";
  mail_smtphost = "example.com";
  mail_smtpport = 465;
  mail_smtpauth = 1;
  mail_smtpname = "cloud_service@example.com";
  mail_smtppassword = "sehr geheim";
};

to:

config = {
  # ...
  mail = {
    mode = "smtp";
    secure = true;
    host = "example.com";
    domain = "example.com";
    fromAddress = "cloud";
    user = "cloud_service@example.com";
    passFile = "/var/secrets/nextcloud-smtp-password";
  };
};

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• Nixpkgs 25.11 Release Notes (or backporting 24.11 and 25.05 Nixpkgs Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
• NixOS 25.11 Release Notes (or backporting 24.11 and 25.05 NixOS Release notes)
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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